<?php

if (!defined('BASEPATH'))
  exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */
// ------------------------------------------------------------------------

/**
 * CodeIgniter Benchmark Class
 *
 * This class enables you to mark points and calculate the time difference
 * between them.  Memory consumption can also be displayed.
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Libraries
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/libraries/benchmark.html
 */
class CI_Benchmark {

  /**
   * List of all benchmark markers and when they were added
   *
   * @var array
   */
  var $marker = array();

  // --------------------------------------------------------------------

  /**
   * Set a benchmark marker
   *
   * Multiple calls to this function can be made so that several
   * execution points can be timed
   *
   * @access	public
   * @param	string	$name	name of the marker
   * @return	void
   */
  function mark($name) {
    $this->marker[$name] = microtime();
  }

  // --------------------------------------------------------------------

  /**
   * Calculates the time difference between two marked points.
   *
   * If the first parameter is empty this function instead returns the
   * {elapsed_time} pseudo-variable. This permits the full system
   * execution time to be shown in a template. The output class will
   * swap the real value for this variable.
   *
   * @access	public
   * @param	string	a particular marked point
   * @param	string	a particular marked point
   * @param	integer	the number of decimal places
   * @return	mixed
   */
  function elapsed_time($point1 = '', $point2 = '', $decimals = 4) {
    if ($point1 == '') {
      return '{elapsed_time}';
    }

    if (!isset($this->marker[$point1])) {
      return '';
    }

    if (!isset($this->marker[$point2])) {
      $this->marker[$point2] = microtime();
    }

    list($sm, $ss) = explode(' ', $this->marker[$point1]);
    list($em, $es) = explode(' ', $this->marker[$point2]);

    return number_format(($em + $es) - ($sm + $ss), $decimals);
  }

  // --------------------------------------------------------------------

  /**
   * Memory Usage
   *
   * This function returns the {memory_usage} pseudo-variable.
   * This permits it to be put it anywhere in a template
   * without the memory being calculated until the end.
   * The output class will swap the real value for this variable.
   *
   * @access	public
   * @return	string
   */
  function memory_usage() {
    return '{memory_usage}';
  }

}

// END CI_Benchmark class

/* End of file Benchmark.php */
/* Location: ./system/core/Benchmark.php */